Properties of HEDP: HEDP is an organic phosphonic acid corrosion inhibitor, can dissociate into five positive and negative ions in the water, can chelate Divalent metal ions in the water, and iron, copper, aluminum, zinc and other metal ions forming a stable complex, has a good scale effect.

Specification of HEDP Standard HG/T3537-1999

Appearance

Clear, Colorless to pale yellow aqueous solution

Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%≥

50.0

60.0

90.0

Phosphorous acid (as PO33-)%)≤

2.0

2.0

0.80

Phosphoric acid (asPO43- )% ≤

0.8

0.8

0.50

Chloride (as Cl-)% ≤

0.01

0.01

0.10

pH (1% solution) ≤

2.0

2.0

2.0

Density (20°C)g/cm3 ≥

1.34

1.40

--

Chelating valuemg/g

450

500

Fe2+,mg/L≤

10.0

10.0

5.0

Active content(HEDP·H2O)% ≤

--

--

98.0

Usage of HEDP:

1. HEDP is used as scale and corrosion inhibition in circulating cool water system,

3. In light woven industry, HEDP is used as detergent for metal and nonmetal.

4. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent;

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